Fix an example in docstring of HTTPServer
Merge pull request #1217 from noxiouz/http_server_doc__fix

Fix an example in docstring of HTTPServer
Update dependency versions in maint/requirements.txt
Streamline tox configuration using new features in tox 1.8.
Fix byte strings as header values in curl_httpclient and python3.

Add the -bb flag to all py3 tests, which uncovered this bug.
Disable pycares tests on travis due to ipv6 issues.
Document that the blog demo is py2-only.
Catch StreamClosedError in StaticFileHandler.

Closes #1208.
Handle closed connections in WebSocketHandler.

Closes #1174.
Add another ignore_bytes_warning call to log_test.

This fixes a failure apparently introduced by changes to warning
logic in python 3.4.2.
Fixed example in doc string

We have to pass a HTTPHeaders object to write_headers()
Merge pull request #1222 from glaslos/patch-1

Fixed example in doc string
Change connection-refused test from localhost to 127.0.0.1.

This might be contributing to occasional timeouts on travis-ci
(on the theory that some other test may be listening on the
same port on ::1).

Also explicitly stop the test if connect_callback is called.